Connected: An Internet Encyclopedia
RFC 1332 - 4. Van Jacobson TCP/IP header compression

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### 4. Van Jacobson TCP/IP header compression

Van Jacobson TCP/IP header compression reduces the size of the TCP/IP headers to as few as three bytes. This can be a significant improvement on slow serial lines, particularly for interactive traffic.

The IP-Compression-Protocol Configuration Option is used to indicate the ability to receive compressed packets. Each end of the link must separately request this option if bi-directional compression is desired.

The PPP Protocol field is set to the following values when transmitting IP packets:

       Value (in hex)

       0021      Type IP.  The IP protocol is not TCP, or the packet is a
                 fragment, or cannot be compressed.

       002d      Compressed TCP.  The TCP/IP headers are replaced by the
                 compressed header.

       002f      Uncompressed TCP.  The IP protocol field is replaced by
                 the slot identifier.

4.1. Configuration Option Format

Next: 4.1. Configuration Option Format

Connected: An Internet Encyclopedia
RFC 1332 - 4. Van Jacobson TCP/IP header compression